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PHP is a general-purpose scripting language geared towards web development. [9] It was originally created by Danish-Canadian programmer Rasmus Lerdorf in 1993 and released in 1995. [10][11] The PHP reference implementation is now produced by the PHP Group. [12] PHP was originally an abbreviation of Personal Home Page, [13][14] but it now stands ...
RAM limit. The maximum random access memory (RAM) installed in any computer system is limited by hardware, software and economic factors. The hardware may have a limited number of address bus bits, limited by the processor package or design of the system. Some of the address space may be shared between RAM, peripherals, and read-only memory.
Commit charge. In computing, commit charge is a term used in Microsoft Windows operating systems to describe the total amount of virtual memory of all processes that must be backed by either physical memory or the page file. [1] Through the process of paging, the contents of this virtual memory may move between physical memory and the page file ...
The 2 GB limit refers to a physical memory barrier for a process running on a 32-bit operating system, which can only use a maximum of 2 GB of memory. [1] The problem mainly affects 32-bit versions of operating systems like Microsoft Windows and Linux, although some variants of the latter can overcome this barrier. [2]
Operation. Most PHP accelerators work by caching the compiled opcode / bytecode of PHP representation of php files to avoid the overhead of parsing and compiling source code on each request (some or even most of which may never be executed). To further improve performance, the cached code is stored in shared memory and directly executed from ...
Zend OPcache (ex. Zend Optimizer+) Zend OPcache[9] is an open source [10] component of Zend Server and Zend Server Community Edition bundled with the PHP language itself. [7] Zend OPcache speeds up PHP execution by opcode caching and optimization. It stores precompiled script bytecode in shared memory.
Double Data Rate 4 Synchronous Dynamic Random-Access Memory (DDR4 SDRAM) is a type of synchronous dynamic random-access memory with a high bandwidth ("double data rate") interface. Released to the market in 2014, [2][3][4] it is a variant of dynamic random-access memory (DRAM), some of which have been in use since the early 1970s, [5] and a ...
3 GB barrier. In computing, the term 3 GB barrier refers to a limitation of some 32-bit operating systems running on x86 microprocessors. It prevents the operating systems from using all of 4 GiB (4 × 10243 bytes) of main memory. [1] The exact barrier varies by motherboard and I/O device configuration, particularly the size of video RAM; it ...